Thought I'd take a closer look at the lobster connection... Turns out, they're not that similar at all. In fact, you probably have more in common (taxonomically speaking) with your pet cat... Sorry...

cockroach

Domain: Eukaryota () - Whittaker & Margulis,1978
Kingdom: Animalia () - Linnaeus, 1758 - animals
Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
Branch: Protostomia () - Grobben, 1908
Infrakingdom: Ecdysozoa () - Aguinaldo Et Al., 1997 Ex Cavalier-Smith, 1998
Superphylum: Panarthropoda () - Cuvier
Phylum: Arthropoda () - Latreille, 1829 - arthropods
Subphylum: Hexapoda () - Snodgrass, 1938
Infraphylum: Atelocerata () - Heymons, 1901
Superclass: Panhexapoda ()
Epiclass: Hexapoda ()
Class: Insecta () - Linnaeus, 1758 - Insects
Subclass: Dicondylia ()
Infraclass: Pterygota ()
Order: Blattodea ()
Superfamily: Blattoidea ()
Family: Blattidae ()
Subfamily: Blattinae ()
Genus: Periplaneta () - Burmeister, 1838
Specific name: americana - (Linnaeus, 1758)
* Scientific name: - Periplaneta americana (Linnaeus, 1758)

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lobster

Domain: Eukaryota () - Whittaker & Margulis,1978
Kingdom: Animalia () - Linnaeus, 1758 - animals
Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
Branch: Protostomia () - Grobben, 1908
Infrakingdom: Ecdysozoa () - Aguinaldo Et Al., 1997 Ex Cavalier-Smith, 1998
Superphylum: Panarthropoda () - Cuvier
Phylum: Arthropoda () - Latreille, 1829 - arthropods
Subphylum: Mandibulata () - Snodgrass, 1938
Infraphylum: Crustaceomorpha () - (Chernyshev, 1960)
Superclass: Crustacea () - Pennant, 1777 - Crustaceans
Epiclass: Eucrustacea ()
Class: Malacostraca () - Latreille, 1802
Subclass: Eumalacostraca () - Grobben, 1892
Superorder: Eucarida () - Calman, 1904
Order: Decapoda () - Latreille, 1802 - Decapods
Suborder: Pleocyemata () - Burkenroad, 1963
Infraorder: Astacidea () - Latreille, 1802
Superfamily: Nephropoidea ()
Family: Nephropidae () - �
Genus: Homarus () - (Linnaeus, 1758)
Specific name: americanus - H. Milne Edwards, 1837
Scientific name: - Homarus americanus H. Milne Edwards, 1837